You’d better take the advice _________ is given by Mr. White.

__________ your new students –Yes, __________.

There ______ lots of bad information which is not ____ for teenagers on the Internet.

It is the educational system, rather than the teachers, _______ is to blame for the students’ heavy burden nowadays.

e whole class, _____ our headteacher, went out to give our school a spring-cleaning the other day.